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<title>Problem 2397. -- 数列    -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>2397: 数列   </h2><span class=green>Time Limit: </span>15 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>128 MB<br><span class=green>Submit: </span>16&nbsp;&nbsp;<span class=green>Solved: </span>6<br>[<a href='submitpage.php?id=2397'>Submit</a>][<a href='problemstatus.php?id=2397'>Status</a>][<a href='bbs.php?id=2397'>Discuss</a>]</center><h2>Description</h2><div class=content><div style="text-align: left" align="left"><span style="font-size: 16pt">&nbsp;</span><span style="font-size: 16pt">&nbsp;</span><span style="font-size: 16pt">给定一个长度为</span><span style="font-size: 16pt">n</span><span style="font-size: 16pt">的数列</span><span style="font-size: 16pt">ai(1&lt;=i&lt;=n)</span><span style="font-size: 16pt">，需要生成一个数列</span><span style="font-size: 16pt">bi(1&lt;=i&lt;=n),</span><span style="font-size: 16pt">每个位置的得分为</span><span style="font-size: 16pt">abs(bi-ai),</span><span style="font-size: 16pt">总得分为各个位置得分的总和，要求</span><span style="font-size: 16pt">abs(bi-bi+1)&lt;=d,a1=b1,an=bn</span><span style="font-size: 16pt">。使得总得分最小。</span></div></div><h2>Input</h2><div class=content><div><span style="font-size: 16pt">多组数据</span></div>
<div><span style="font-size: 16pt">第一行数据组数</span><span style="font-size: 16pt">t</span></div>
<div><span style="font-size: 16pt">每组数据</span></div>
<div style="text-indent: 16pt"><span style="font-size: 16pt">第一行两个整数</span><span style="font-size: 16pt">n(1&lt;=n&lt;=100)</span><span style="font-size: 16pt">，</span><span style="font-size: 16pt">d(1&lt;=d&lt;=10^9); </span></div>
<div style="text-indent: 16pt"><span style="font-size: 16pt">第二行</span><span style="font-size: 16pt">n</span><span style="font-size: 16pt">个整数</span><span style="font-size: 16pt">ai(1&lt;=ai&lt;=10^9)</span><span style="font-size: 16pt">。</span></div></div><h2>Output</h2><div class=content><div><span style="font-size: 16pt">一个整数，为合法最小总得分。</span></div>
<div><span style="font-size: 16pt">无合法解输出</span><span style="font-size: 16pt">impossible</span><span style="font-size: 16pt">。</span></div></div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>3<br />
10 2<br />
4 5 10 6 6 9 4 7 9 8<br />
3 1<br />
6 4 0<br />
4 2<br />
3 0 6 3<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>6<br />
impossible<br />
4</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=By 赖国堃'>By 赖国堃</a></p></div><center>[<a href='submitpage.php?id=2397'>Submit</a>][<a href='problemstatus.php?id=2397'>Status</a>][<a href='bbs.php?id=2397'>Discuss</a>]</center>﻿<br>

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